What driver behavior does a yellow arrow primarily encourage?

A yellow arrow signals to drivers that they should proceed with caution when turning. This type of signal indicates that the light is about to change to red, and drivers need to be careful as they make their turn. The yellow arrow prompts the driver to prepare to stop if it’s not safe to complete the turn or if they are still in the intersection when the light changes. By encouraging caution, the yellow arrow ensures that drivers are attentive to both oncoming traffic and pedestrians, promoting safety during the turning process.

The other options suggest behaviors that do not align with the message of the yellow arrow. Continuing at the same speed could lead to dangerous situations, especially when the signal is transitioning. Ignoring all other signals contradicts the need for drivers to be aware of their surroundings, and accelerating to get ahead is not advisable when a signal indicates a potential change.